Exhaust leak 02 sensor have coded?

2017 NISSAN SENTRA
66,000 MILES • 4 CYL • 2WD
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DMAURICE
  • MEMBER
  • 1 POST
Your steps to the visit and replacement were great, thanks. A dealer is now replacing the exhaust manifold. I don’t know if there are two. My question is, shouldn’t the 02 sensor have coded with an exhaust leak into the cabin air?
Mar 19, 2026 at 9:56 AM
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STEVE W.
  • ✓ASE Certified Mechanic
  • 15,200 POSTS
  • ASE Certified Mechanic
It depends on where the leak is and if it is bad enough to allow air in that registers on the O2. Many times a leak does nothing but create noise.
Mar 20, 2026 at 1:32 AM
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